diff --git a/src/reagent/impl/component.cljs b/src/reagent/impl/component.cljs
index d3f9538..f54fbad 100644
--- a/src/reagent/impl/component.cljs
+++ b/src/reagent/impl/component.cljs
@@ -167,7 +167,10 @@
                          new-argv ($ nextprops :argv)
                          noargv (or (nil? old-argv) (nil? new-argv))]
                      (cond
-                       (nil? f) (or noargv (not= old-argv new-argv))
+                       (nil? f) (or noargv (try (not= old-argv new-argv)
+                                                (catch :default e
+                                                  (warn "Exception thrown while comparing argv's in shouldComponentUpdate. You probably need to set different keys." old-argv new-argv e)
+                                                  false)))
                        noargv (.call f c c (get-argv c) (props-argv c nextprops))
                        :else  (.call f c c old-argv new-argv))))))